1040 
modified into the normal rbythin of the ventricle. A more explicit 
explanation of these artificial modifications of rhythm can be found 
in the communication dealing with the artificial modification of rhythm 
after the poisoning of a frog’s heart with veratrine’). 
If now we restrict our ‘discussion to the ventricle, we have during 
the 2rd stage of the poisoning the following modifications: 
1. Halvings of rhythm 
2. Formation of groups. 
3.  Alternation. 
4. Deformed systoles (often with more than 1 top). 
5. Abortive systoles. 
The image of the curves in this stage is often a very irregular 
one, and it ean only be analysed by taking into account the devia- 
tions of shape mentioned above. In Fig. 13 such an irregular image 
MUL 
Fig. 13. 
{5 ec 
of curves is represented. Now a systole of the ventricle falls out, 
now an enlarged systole of the ventricle occurs; after such an 
enlarged systole a little abortive one can follow, as I described 
above. Between these deformed systoles occur, on account of distur- 
bances in the conductibility in the ventricle. In this way the play 
of the curves that was at first incomprehensible, becomes clearer. 
When the ventricle functions so irregularly, then the last stage is 
certainly reached which in literature is indicated as the toxical 
Fig. 14. 
1) These Proceedings Vol. XVIII Ne. 10 pag. 1588, 1916. 
